/*
 * The MIT License
 *
 * Copyright 2012 http://generic-toolset.googlecode.com.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.rlpw.swing;

import java.util.*;

class FilteredList<T> extends AbstractList<T> {

    private View<T> view;
    private Filter<T> filter;
    private Comparator<T> sorter;
    private List<T> data = new ArrayList<>();

    @SuppressWarnings("OverridableMethodCallInConstructor")
    public FilteredList(final View<T> view) {
        this.view = view;
        update();
    }

    void update() {

        if (isForwarding()) {
            return;
        }

        data.clear();
        for (T item : view.getDataModel()) {
            if (filter == null || getFilter().isVisible(item)) {
                data.add(item);
            }
        }
        if (getSorter() != null) {
            Collections.sort(data, getSorter());
        }

    }

    int toDataModelIndex(int index) {
        return view.getDataModel().indexOf(get(index));
    }

    int toViewIndex(int index) {
        return indexOf(view.getDataModel().get(index));
    }

    Filter<T> getFilter() {
        return filter;
    }

    void setFilter(Filter<T> filter) {
        this.filter = filter;
        update();
        view.updateView();
    }

    Comparator<T> getSorter() {
        return sorter;
    }

    void setSorter(Comparator<T> sorter) {
        this.sorter = sorter;
        update();
        view.updateView();
    }

    private boolean isForwarding() {
        return getFilter() == null && getSorter() == null;
    }

    @Override
    public T get(int index) {
        if (isForwarding()) {
            return view.getDataModel().get(index);
        } else {
            return data.get(index);
        }
    }

    @Override
    public int size() {
        if (isForwarding()) {
            return view.getDataModel().size();
        } else {
            return data.size();
        }
    }
}
